CN210786770U - Waste gas treatment device for aluminum smelting furnace - Google Patents

Abstract

The utility model provides a waste gas treatment device for an aluminum smelting furnace, which comprises a condensation chamber and a drying and dust removal chamber. The top of the condensation chamber is provided with an exhaust gas outlet, and the drying and dust removal chamber communicates with the exhaust gas outlet through the waste gas outlet. The condensing chamber is in communication, the side wall of the condensing chamber is provided with a spiral condensing pipe, the bottom of the condensing chamber is provided with an exhaust gas inlet, and the upper side of the exhaust gas inlet is provided with a number of baffles, and A plurality of the baffles are alternately arranged on the two side walls of the condensation chamber, and a plurality of filter layers are arranged at intervals in the drying and dust removal chamber. The device can not only recover the heat in the exhaust gas through the condensing device to prevent a large amount of heat from being directly discharged, thereby reducing energy consumption and improving energy utilization; it can also effectively intercept tiny particles in the exhaust gas such as PM2. The sulfur dioxide and nitrogen oxides in the waste gas are absorbed to prevent them from being discharged into the atmosphere with the exhaust gas and polluting the atmospheric environment.

Description

A waste gas treatment device for aluminum smelting furnace

technical field

The utility model relates to the field of aluminum smelting and processing equipment, in particular to a waste gas treatment device for an aluminum smelting furnace.

Background technique

Aluminum smelting is a process in which raw materials are added to the smelting furnace for melting according to the process requirements, and higher purity aluminum liquid is obtained by refining methods such as degassing and slag removal. Due to the easy generation of waste gas during the smelting process, the waste gas contains not only combustible organic gases, but also solid particles and dust and other substances. If not treated in time, it is easy to cause unpredictable damage to the atmospheric environment, which is not conducive to environmental protection.

In addition, since the melting temperature of aluminum alloy is often in the range of 670-750 °C, the exhaust gas will also take away a lot of waste heat during the discharge process. If it is not treated, a lot of heat will be lost. The heat is recovered to avoid the waste of resources, and can effectively improve the energy utilization rate.

At present, there are many kinds of waste gas treatment methods for aluminum smelting furnace, such as adsorption method, absorption method, catalytic combustion method, biological oxidation method, heat treatment method, etc. Compared with other treatment methods, the hot water treated by the heat treatment method can be recycled, but the existing treatment equipment cannot intercept tiny particles such as PM2. If colloidal substances are effectively intercepted, and PM2.5 is the main component of smog, it will directly affect the air quality if it is directly discharged into the atmosphere.

Utility model content

In order to solve the above problems, the purpose of the present utility model is to provide a waste gas treatment device for an aluminum smelting furnace, which can not only recover the heat in the waste gas through the condensing device, avoid a large amount of heat being directly discharged, thereby reducing energy It can also effectively intercept tiny particles such as PM2.5 in the exhaust gas, which solves the problem that the existing treatment equipment in the prior art cannot intercept the tiny particles such as PM2.5 in the exhaust gas, and cannot The problem of effective retention of solid substances with relatively small particle size, such as colloidal substances.

To achieve the above purpose, the technical solutions of the present invention are as follows.

A waste gas treatment device for an aluminum smelting furnace, comprising a condensation chamber and a drying and dust removal chamber, the top of the condensation chamber is provided with an exhaust gas outlet, and the drying and dust removal chamber communicates with the condensation chamber through the waste gas outlet , the side wall of the condensation chamber is provided with a spiral condensation pipe, the bottom of the condensation chamber is provided with an exhaust gas inlet, the upper side of the exhaust gas inlet is provided with a number of baffles, and a number of the The baffles are alternately arranged on the two side walls of the condensation chamber, and a plurality of filter layers are arranged at intervals in the drying and dust removal chamber.

Further, the spiral condenser tube is detachably connected to the side wall of the condensation chamber through a snap-fit assembly. One end of the spiral condenser tube is provided with a liquid inlet, and the other end is provided with a liquid outlet. The condensation chamber is close to One side of the drying and dust removal chamber is provided with a water inlet pipe, the side of the condensation chamber close to the exhaust gas outlet is provided with a water outlet pipe, and the liquid inlet of the spiral condenser pipe is detachably connected to the water inlet pipe, so the The liquid outlet of the spiral condenser pipe is detachably connected to the water outlet pipe.

Further, the side of the spiral condenser tube facing the center of the condensation chamber is provided with a number of water jets, each of which is installed with a jet, and each of the jets can be connected to the water jet through a sealing ring. Disassemble the connection; each of the spray heads is provided with a solenoid valve.

Further, the bottom of the condensation chamber is provided with a slag discharge port, a screen is installed on the slag discharge port, a discharge funnel is provided at the lower end of the slag discharge port, and a discharge control valve is provided on the discharge funnel.

Further, the filter layer includes a microfiltration plate and a nanofiltration plate, the pore size of the filter holes on the microfiltration plate is larger than the pore size of the filter holes on the nanofiltration plate, and the microfiltration plate is installed on the drying The dust chamber is close to the side of the exhaust gas outlet.

Further, the side walls of the drying and dust removal chamber are sequentially provided with a plurality of insertion slots for installing the corresponding filter layers, and each of the filter layers can be detachably installed in the corresponding insertion slots. , the top of each filter layer is provided with a handle, the top of each plug slot is provided with a plug hole for installing the filter layer, and each plug hole is hinged with a seal cover.

Further, each of the filter layers includes a honeycomb core board and a mounting shell for installing the honeycomb core board, and press-fit filter boards are installed on both sides of the honeycomb core board. The boards are all detachably connected to the honeycomb core board.

Further, a gas connection pipe is provided on one end of the drying dust chamber away from the exhaust gas outlet, a drying box is provided on the side of the drying dust chamber close to the gas connection pipe, and an inlet is provided on the top of the drying box. The feeding port is provided with a feeding sealing door, one side of the drying box is provided with a discharging port, and the discharging port is provided with a discharging sealing door, the feeding sealing door, the outlet The material sealing doors are hinged with the side wall of the drying and dust removal chamber; a transparent observation window is provided on the side of the drying and dust removal chamber close to the drying box.

Further, it also includes an incinerator, a burner is provided on one side of the incinerator, the incinerator is connected to the drying and dust removal chamber through the burner, and an air intake pipe is connected to one side of the burner.

Further, the side of the incinerator away from the burner is provided with an adsorption tower, the top of the adsorption tower is provided with a discharge port, the side of the adsorption tower close to the discharge port is provided with an adsorption layer, and the adsorption layer is provided with an adsorption layer. There are desulfurization and denitration fillers inside.

The beneficial effects of the present utility model:

Compared with the prior art, the utility model provides a waste gas treatment device for an aluminum smelting furnace, which can not only recover the heat in the waste gas through the spiral condensation pipe in the condensation chamber, but also can recover the hot water after the heat recovery. Put it back into use to avoid a large amount of heat being directly discharged, thereby reducing energy consumption and improving energy utilization.

It can also effectively intercept tiny particles such as PM2.5 in the exhaust gas, absorb sulfur dioxide and nitrogen oxides in the exhaust gas, and prevent them from being discharged into the atmosphere with the exhaust gas and pollute the atmospheric environment; it solves the existing treatment in the prior art. The equipment cannot intercept tiny particles such as PM2.5 in the exhaust gas, nor can it effectively intercept solid substances with relatively small particle sizes, such as colloidal substances.

The waste gas treatment device of the utility model adopts the heat treatment method, which improves the air purification efficiency, reduces the investment and operation cost, and achieves an economical and efficient treatment effect, all of which have good application prospects.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

FIG. 2 is a schematic structural diagram of a condensation chamber in Embodiment 1 of the present invention from a first perspective.

3 is a schematic structural diagram of a drying and dust removal chamber in Embodiment 1 of the present invention.

4 is a schematic structural diagram of a filter layer in Embodiment 1 of the present invention.

FIG. 5 is a schematic structural diagram of a condensation chamber from a second perspective in Embodiment 2 of the present invention.

FIG. 6 is a schematic structural diagram of Embodiment 3 of the present invention.

In the figure: 1. Condensing chamber; 11. Exhaust gas inlet; 12. Exhaust gas outlet; 13. Spiral condenser pipe; 131. Nozzle; 14. Baffle plate; Water pipe; 18, slag outlet; 181, screen; 19, discharge funnel; 191, discharge control valve; 2, drying and dust removal chamber; 21, filter layer; 211, micro filter plate; 212, nano filter plate; 213 , honeycomb core board; 214, installation shell; 215, press-fit filter plate; 22, insertion slot; 23, insertion hole; 24, sealing cover; 25, gas connection pipe; 26, drying box; 261, feeding port; 262, feed sealing door; 263, discharge port; 264, discharge sealing door; 27, transparent observation window; 3, incinerator; 31, incinerator; 32, air intake pipe; 4, adsorption tower; 41, The discharge port; 42, the adsorption layer.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, "a number of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such technical solutions The combination does not exist and is not within the protection scope required by the present invention.

Example 1

Referring to Figures 1-4, a waste gas treatment device for an aluminum material smelting furnace provided by the embodiment of the present invention can effectively treat the waste gas in the aluminum material smelting furnace, so that the indicators of the discharged lifted All meet air pollutant emission standards.

The device includes a condensation chamber 1 and a drying and dust removal chamber 2. The top of the condensation chamber 1 is provided with an exhaust gas outlet 12, and the drying and dust removal chamber 2 communicates with the condensation chamber 1 through the exhaust gas outlet 12, so that the gas treated by the condensation chamber can pass through the exhaust gas. The air outlet enters into the drying and dust removal chamber.

A spiral condenser tube 13 is spirally arranged on the side wall in the condensation chamber 1, and an exhaust gas inlet 11 is arranged at the bottom of the condensation chamber 1. One end of the spiral condenser pipe 13 is provided with a liquid inlet, and the other end is provided with a liquid outlet. The side of the condensation chamber 1 close to the drying and dust removal chamber 2 is provided with a water inlet pipe 16, and the side of the condensation chamber 1 close to the exhaust gas outlet 12 is provided with The water outlet pipe 17 and the liquid inlet of the spiral condenser pipe 13 are detachably connected to the water inlet pipe 16 , and the liquid outlet of the spiral condenser pipe 13 is detachably connected to the water outlet pipe 17 .

Here, the liquid inlet and the liquid outlet of the spiral condensing pipe are sealed and connected with the water inlet pipe and the water outlet pipe respectively through flanges, so as to improve the tightness and tightness of the connection. Since the smelting temperature in the smelting furnace is usually in the range of 670-750 °C, the higher temperature will make the exhaust gas of the smelting furnace have higher thermal energy. During the operation of the exhaust gas outlet, the cold water in the spiral condensing tube can be heated to make the water temperature rise to hot water. The hot water re-enters the boiler through the water outlet pipe, and the boiler continues to heat it into steam for the boiler. In this process, the heat in the high-temperature exhaust gas is recovered, preventing a large amount of heat from being directly discharged, thereby reducing energy consumption and improving energy utilization.

In order to further prolong the residence time of the exhaust gas in the condensing chamber and improve the heat conversion rate, a plurality of baffles 14 are provided on the upper side of the exhaust gas inlet 11 , and the plurality of baffles 14 are alternately arranged on two sides of the condensing chamber 1 . on the side wall. The bottom of the condensation chamber 1 is provided with a slag discharge port 18 , a screen 181 is installed on the slag discharge port 18 , a discharge funnel 19 is provided at the lower end of the slag discharge port, and a discharge control valve 191 is provided on the discharge funnel 19 .

In this embodiment, three baffles are arranged on the upper side of the exhaust gas inlet, and a first baffle, a second baffle and a third baffle are arranged in sequence from bottom to top. The first baffle is located above the exhaust gas inlet, one end of the first baffle is fixed to the inner wall of the condensation chamber, and the other end is spaced apart from the opposite side wall; the second baffle is fixed on the first baffle The plates are opposite to the inner wall of the condensation chamber, and there is a distance between the second baffle plate and the inner wall of the condensation chamber to which the first baffle plate is fixed; the third baffle plate is fixed on the same inner wall of the condensation chamber as the first baffle plate, and the third baffle plate is There is a distance between the three baffles and the inner wall of the condenser to which the second baffle is fixedly connected.

The exhaust gas discharged from smelting not only contains high heat, but also contains a large amount of unburned particulate matter and dust. The discharge of these substances into the atmosphere will cause the deterioration of the atmospheric environment and affect human health. In this embodiment, setting the first baffle, the second baffle and the third baffle in the condensation chamber can not only prolong the residence time of the exhaust gas in the condensation chamber, but also conduct multi-stage interception of particulate matter and dust. The particulate matter and dust in the dust-laden exhaust gas entering the condensing chamber first collide with the first baffle plate, thereby changing direction and falling, while the remaining dust-laden exhaust gas bypasses the first baffle plate and passes from the first baffle plate and the condensation inner wall parts. The gap continues to rise, and when it encounters the second baffle, the dust contained in the gas collides with the second baffle and falls, and the remaining dust-containing exhaust gas bypasses the second baffle and flows from the second baffle and the inner wall of the condenser. The gap between them continued to rise, and finally collided with the third baffle, thereby changing direction and landing. After the three-stage collision, the particulate matter and dust in the exhaust gas are basically removed.

In this embodiment, the first baffle plate and the second baffle plate partially overlap, and the length of the overlapping portion is in the range of 1/10-1/4 of the length of the second baffle plate. The second baffle and the third baffle partially overlap, and the length of the overlapping portion is in the range of 1/10-1/4 of the length of the second baffle. Such an arrangement can make the exhaust gas detour upward in an S-shape, which can not only prolong the residence time of the exhaust gas in the condensation chamber, but also effectively trap particulate matter and dust.

For some solid substances with relatively small particle size in the exhaust gas, such as colloidal substances and PM2.5, the multi-layer baffles in the condensation chamber cannot effectively intercept them. A drying and dust-removing chamber that dries the gas.

Several filter layers 21 are arranged at intervals in the drying and dust removal chamber 2 for filtering and retaining tiny particles.

Wherein, the filter layer 21 includes a microfiltration plate 211 and a nanofiltration plate 212. The pore size of the filter holes on the microfiltration plate 211 is larger than the pore size of the filter holes on the nanofiltration plate 212, which facilitates multi-stage filtration of tiny particles in the exhaust gas. . The micro filter plate 211 is installed on the side of the drying dust chamber 2 close to the exhaust gas outlet 12, and the nano filter plate is installed on the side of the micro filter plate away from the exhaust gas outlet. The exhaust gas discharged from the exhaust gas outlet is filtered and purified by the micro filter plate and the nano filter plate in turn, so that the solid particles and dust in the gas can be filtered and purified.

In order to facilitate the replacement of the filter layer, a plurality of plug slots 22 for installing the corresponding filter layer 21 are arranged on the side wall of the drying and dust removal chamber 2 in sequence, and each filter layer 21 can be detachably installed in the In the corresponding insertion slot 22, a handle is provided on the top of each filter layer 21, and the top of each insertion slot 22 is provided with an insertion hole 23 for installing the filter layer 21. Each insertion hole 23 A sealing cover 24 is hinged on both. When the filter layer is replaced, the corresponding filter layer can be inserted into the corresponding insertion hole only by opening the sealing cover, and inserted along the insertion slot, which improves the replacement efficiency.

Each filter layer 21 includes a honeycomb core board 213 and a mounting shell 214 for installing the honeycomb core board 213 . Press-fit filter boards 215 are installed on both sides of the honeycomb core board 213 , and each press-fit filter board 215 is connected to The honeycomb core panel 213 is detachably connected. In this embodiment, the shape of the mounting shell is a hollow annular shell, which facilitates the mounting of the honeycomb core board in the hollow part.

A gas connection pipe 25 is provided on one end of the drying dust chamber 2 away from the exhaust gas outlet 12, a drying box 26 is provided on the side of the drying dust chamber 2 close to the gas connection pipe 25, and a feeding port 261 is provided on the top of the drying box 26. The material inlet 261 is provided with a feeding sealing door 262, one side of the drying box 26 is provided with a discharging port 263, and the discharging port 263 is provided with a discharging sealing door 264. The feeding sealing door 262 and the discharging sealing door 264 are both It is hinged with the side wall of the drying and dust removal chamber 2; the side of the drying and dust removal chamber 2 close to the drying box 26 is provided with a transparent observation window 27. In this embodiment, the drying box is filled with color-changing silica gel, and the color of the color-changing silica gel in the drying box can be observed through the observation window, which is convenient for timely replacement. When replacing, discharge the discolored silica gel in the drying box from the discharge port on one side, then close the discharge sealing door, fill in new color-changing silica gel from the feeding port, and close the feeding sealing door to improve the replacement s efficiency.

The drying and dust removal chamber in this embodiment is divided into a plurality of purification chambers by a filter layer and a drying box, which facilitates multi-stage purification of exhaust gas and improves the degree of purification.

Example 2

Referring to FIG. 5 , the difference from the above-mentioned embodiment is that the side of the spiral condenser tube 13 facing the center of the condensation chamber 1 is provided with a plurality of water spray ports, and each water spray port is provided with a spray head 131 . 131 are detachably connected to the water spout through a sealing ring; each spout 131 is provided with a solenoid valve.

A controller is provided outside the condensation chamber, and the controller is electrically connected with a plurality of solenoid valves for controlling the opening of the plurality of solenoid valves. There are several nozzles on the spiral condensing pipe, which is convenient for flushing the solid particles in the condensing chamber and avoids excessive dust accumulation in the gaps that cannot be cleaned. The opening of the solenoid valve on the nozzle is controlled by the controller to improve the cleaning efficiency.

Example 3

Referring to FIG. 6 , the difference from the above embodiment is that an incinerator 3 is also included, and the waste gas generated in the smelting furnace contains a relatively good content of combustible organic gas, so this part of the organic gas needs to be burned. A burner 31 is arranged on one side of the incinerator 3, and a low-carbon oxide conical burner is arranged in the burner to accelerate the mixing degree of the combustible organic gas in the air and the exhaust gas, so that it can be fully burned. The incinerator 3 is connected to the drying and dust removal chamber 2 through a burner 31, and an air intake pipe 3 is connected to one side of the burner 31. The air intake pipe is provided with a solenoid valve and a flow meter to adjust the intake air volume, so that the combustible The organic waste gas can be fully burned.

The incinerated gas may contain sulfur dioxide and nitrogen oxides. Therefore, the incinerated gas needs to be adsorbed to meet the emission standards. The side of the incinerator 3 away from the burner 31 is provided with an adsorption tower 4, the top of the adsorption tower 4 is provided with a discharge port 41, the side of the adsorption tower 4 close to the discharge port 41 is provided with an adsorption layer 42, and a desulfurization layer 42 is provided in the adsorption layer 42. Denitrification filler. Among them, the desulfurization and denitration fillers are mainly prepared by mixing magnesium oxide, magnesium chloride, phosphoric acid, and glass fibers in a mass ratio of 5:8:0.5:0.5, and commonly used binders and foaming agents are also added to the fillers. These components can adsorb sulfur dioxide and nitrogen oxides in exhaust gas very well, avoiding their pollution to the atmosphere.

The exhaust gas after the above treatment has been well purified, and is discharged into the atmosphere from the discharge port at the top of the adsorption tower, and the indicators of the discharged gas can meet the air pollutant emission standards.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in the present utility model. within the scope of protection.

Claims (10)

1. The utility model provides an exhaust treatment device for aluminum product smelting furnace, a serial communication port, including condensation chamber (1) and dry clean room (2), the top of condensation chamber (1) is equipped with waste gas outlet (12), dry clean room (2) are passed through waste gas outlet (12) with condensation chamber (1) intercommunication, it is provided with spiral condenser pipe (13) to spiral on the lateral wall in condensation chamber (1), the bottom of condensation chamber (1) is equipped with waste gas air inlet (11), the upside of waste gas air inlet (11) is equipped with a plurality of baffle (14), and a plurality of baffle (14) alternate interval set up in proper order on the both sides wall in condensation chamber (1), the interval is equipped with a plurality of filter layer (21) in dry clean room (2).

2. The waste gas treatment device for the aluminum smelting furnace according to claim 1, wherein the spiral condensation pipes (13) are detachably connected with the side wall of the condensation chamber (1) through clamping components (15), one ends of the spiral condensation pipes (13) are provided with liquid inlets, the other ends of the spiral condensation pipes are provided with liquid outlets, one sides of the condensation chamber (1) close to the drying and dust removing chamber (2) are provided with water inlet pipes (16), one sides of the condensation chamber (1) close to the waste gas outlet (12) are provided with water outlet pipes (17), the liquid inlets of the spiral condensation pipes (13) are detachably connected with the water inlet pipes (16), and the liquid outlets of the spiral condensation pipes (13) are detachably connected with the water outlet pipes (17).

3. The exhaust gas treatment device for an aluminum smelting furnace according to claim 1, wherein a plurality of water spraying ports are provided on one side of the spiral condensation pipe (13) facing the center of the condensation chamber (1), each water spraying port is provided with a spray head (131), and each spray head (131) is detachably connected with the water spraying port through a seal ring; each spray head (131) is provided with an electromagnetic valve.

4. The exhaust gas treatment device for an aluminum smelting furnace according to claim 1, wherein a slag discharge port (18) is provided at the bottom of the condensation chamber (1), a screen (181) is installed on the slag discharge port (18), a discharge hopper (19) is provided at the lower end of the slag discharge port, and a discharge control valve (191) is provided on the discharge hopper (19).

5. The exhaust gas treatment apparatus for an aluminum smelting furnace according to claim 1, wherein the filter layer (21) comprises a micro filter plate (211) and a nano filter plate (212), the pore size of the pores on the micro filter plate (211) is larger than the pore size of the pores on the nano filter plate (212), and the micro filter plate (211) is installed on the side of the dry and clean chamber (2) near the exhaust gas outlet (12).

6. The waste gas treatment device for the aluminum smelting furnace according to claim 1, wherein a plurality of insertion grooves (22) matched with the corresponding filtering layers (21) are sequentially arranged on the side wall in the drying and dust removing chamber (2), each filtering layer (21) is detachably arranged in the corresponding insertion groove (22), a handle is arranged at the top of each filtering layer (21), an insertion hole (23) used for installing the filtering layer (21) is arranged at the top of each insertion groove (22), and a sealing cover (24) is hinged to each insertion hole (23).

7. The exhaust gas treatment apparatus for an aluminum smelting furnace according to claim 1, wherein each of the filter layers (21) comprises a honeycomb core (213) and a mounting case (214) for mounting the honeycomb core (213), press-fitted filter plates (215) are mounted on both sides of the honeycomb core (213), and each of the press-fitted filter plates (215) is detachably connected to the honeycomb core (213).

8. The exhaust gas treatment device for the aluminum smelting furnace according to claim 1, wherein a gas connecting pipe (25) is arranged at one end of the drying and dust removing chamber (2) far away from the exhaust gas outlet (12), a drying box (26) is arranged at one side of the drying and dust removing chamber (2) close to the gas connecting pipe (25), a feeding hole (261) is formed in the top of the drying box (26), a feeding sealing door (262) is arranged on the feeding hole (261), a discharging hole (263) is formed at one side of the drying box (26), a discharging sealing door (264) is arranged on the discharging hole (263), and the feeding sealing door (262) and the discharging sealing door (264) are hinged with the side wall of the drying and dust removing chamber (2); and a transparent observation window (27) is arranged on one side of the drying dust chamber (2) close to the drying box (26).

9. An exhaust gas treatment apparatus for an aluminum smelting furnace according to claim 1, further comprising an incinerator (3), wherein a burner (31) is provided at one side of the incinerator (3), the incinerator (3) is connected to the drying and dust removing chamber (2) through the burner (31), and an air intake duct (32) is connected to one side of the burner (31).

10. The exhaust gas treatment apparatus for an aluminum smelting furnace according to claim 9, wherein an adsorption tower (4) is provided at a side of the incinerator (3) away from the burner (31), a discharge port (41) is provided at a top end of the adsorption tower (4), an adsorption layer (42) is provided at a side of the adsorption tower (4) near the discharge port (41), and desulfurization and denitrification filler is provided in the adsorption layer (42).

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